Direct memory access CRT display controller for display of radionuclide images

The need for high-fidelity computer output of radionuclide images is a long-standing problem in nuclear medicine computer applications. Three years ago we recognized the need for a device which would handle both static and dynamic images, permit interactive control of image display parameters, and operate with very little software overhead and CPU burden. We have built such a device and it has served reliably as the principal image output device for our dedicated PDP-12 computer system. It operates in 32 by 32 or 64 by 64 mode, has six bits of Z- axis resolution, handles areas-of-interest and cursor display functions, and permits an adjustable window to be used for selection of the Z-axis intensities to be displayed. This device is flicker-free and has been assembled using less than $1000.00 in parts (excluding the CRT), 300 man-hours of labor (including design time) and has operated with less than 1 percent down-time for 1$sup 1$/ $sub 2$ years. This device has served an invaluable role in our investigative endeavors and is indispensable in assuring maximal information extraction from routine clinical data. A PDP-11 version of this device has also been constructed for display of 128 by 128 images. (auth)